Former communications minister, Labor senator Stephen Conroy says the Government is trying to hide its embarrassment over NBN cost blowouts.

CANBERRA – Labor frontbencher Stephen Conroy has declared an "extraordinary attack on the parliament" with Australian Federal Police (AFP) raids at Parliament House into the leaking of classified documents from the National Broadband Network (NBN).

The former Communications Minister and Shadow Special Minister of State has revealed the AFP will raid Department of Parliamentary Services offices on Wednesday to access Labor staff emails.

The Communications Minister Mitch Fifield insists the AFP is going about its business and is operating independently from Government, but Senator Conroy is crying foul.

Stephen Conroy: "What we're seeing here is an attempt to intimidate ppl to not actually do their parliamentary duties" #NBNleak#auspol#AFP

"The facts are that NBN was concerned about the alleged theft of commercial in confidence material. NBN did was completely within their rights as an organisation and that is to the relevant authorities to investigate."

Mitch Fifield: "I have complete confidence in the AFP". He says Stephen Conroy is seeking to besmirch the AFP over NBN leaks #auspol